MathSciDoc: An Archive for Mathematician ∫

@inproceedings{g.1897periodic,
  title={Periodic Orbits},
  author={G. H. Darwin},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203002260959034},
  booktitle={Acta Mathematica},
  volume={21},
  number={1},
  pages={99-242},
  year={1897},
}